MR2 Aerodynamics Report - MR2 Owners Club Message Board
 
LinkBack Thread Tools
post #1 of 8 (permalink) Old July 28th, 2014, 16:44 Thread Starter
Registered User
 
Join Date: Sep 2012
Age: 31
Posts: 73
OldTrader Rating: (2)
Thumbs up MR2 Aerodynamics Report

Hello everyone,

I work at a University completing my PhD in automobile aerodynamics. Since I own a 1988 MR2 I thought I'd put it in our test facility and see what happens. A year and a ton of analysis later, I've finally finished it. The report is somewhat big (due to all the images) but I've hosted it on my website and hopefully there should be no download problems.

GO HERE FOR THE FULL REPORT!

As a sample of what I have done, here are some pics. But the report has everything, pictures, videos, analysis, recommendations.



aeroMR2 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old July 28th, 2014, 21:48
Registered User
 
Join Date: Apr 2009
Location: Ashburn, Virginia
Age: 27
Posts: 1,546
OldTrader Rating: (26)
Wow, that's really cool. Would it be fairly easy to do something like this for a MK2?
MR2Singh is offline  
post #3 of 8 (permalink) Old July 29th, 2014, 06:26 Thread Starter
Registered User
 
Join Date: Sep 2012
Age: 31
Posts: 73
OldTrader Rating: (2)
Thank you. It would be "easy" in the sense that to get some data all I would need is to buy a model of a Mk2 and put it in the facility. However, processing all the data and making sense of the results is the time consuming part. If there is enough desire, I could try and put something together.
aeroMR2 is offline  
Sponsored Links
Advertisement
 
post #4 of 8 (permalink) Old July 29th, 2014, 06:55 Thread Starter
Registered User
 
Join Date: Sep 2012
Age: 31
Posts: 73
OldTrader Rating: (2)
Thought I would post a few videos for those of you who haven't looked at the .pdf report yet.

Stock rear end

Rear end with spoiler

Rear end with hatchback

The videos show the change in streamwise (U) velocity, blue regions are slow moving or reverse flow.
aeroMR2 is offline  
post #5 of 8 (permalink) Old August 4th, 2014, 07:23
MR2OC Founder
 
Bill Strong's Avatar
 
Join Date: Sep 1999
Location: Lovingston, Va
Age: 56
Posts: 42,296
OldTrader Rating: (122)
Did you take into account the flow through the engine bay and how it interacts with the "dead" flow over the engine compartment? There is quite a bit of flow through this area, and that has an effect on the flow of the spoiler.
And you use "Downforce" a lot in the paper. I read a lot of papers concerning automotive aero and they are normally written a lot different then you wrote yours.
I see no hard numbers, just opinion.
Your elevated wing data give no data about what wing profiles were used.

Bill Strong
Marketing Director
On-Air Host
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

ChampCar Endurance Series


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Bill Strong is offline  
post #6 of 8 (permalink) Old August 4th, 2014, 19:58 Thread Starter
Registered User
 
Join Date: Sep 2012
Age: 31
Posts: 73
OldTrader Rating: (2)
Bill. As I noted right at the beginning of my report, the model has several discrepancies when compared to the actual car. Chief among them is no engine bay or through-flow in this area. I am working toward producing a 3D printed model which will incorporate this feature.

I'm not sure what you mean regarding my usage of downforce, in the context of my report it is used to describe negative lift. As per the difference in writing style. Generally aeronautical and mechanical engineers have their own "ways" of writing about aerodynamics. I am coming from an aeronautical background, so some of my explanations are more in-line with how they are presented in that community. If there is anything unclear, I would be happy to clarify.

As I mentioned in my report, I was unable to make direct drag and lift force measurements. That apparatus is currently being assembled and calibrated and may be used in the future. The report focuses on the overall changes in flow structure as measured by PIV, which is a standardized technique used in the experimental flow community. Changes to the flow structure can be used to infer changes in aerodynamic forces. And yes, when it comes down to it, some of my comments are my opinion, however they are the opinion of someone who studies this for a living (that's not to say I am 100% accurate, but perhaps more convincing).

As for the elevated wing, I have no idea what wing profiles were used. The wing came with the model that I purchased. They were highly cambered non-symmetric profiles. My guess is something like Selig 1223 profiles or something similar.

Last edited by aeroMR2; August 4th, 2014 at 20:01.
aeroMR2 is offline  
post #7 of 8 (permalink) Old August 9th, 2014, 14:14
Registered User
 
Join Date: Aug 2014
Posts: 1
OldTrader Rating: (0)
Wow, good work aeroMR2, thanks for taking the time (while working on your PhD in automobile aerodynamics) to do this. Good luck on the PhD

Last edited by greatgordo; August 9th, 2014 at 14:54.
greatgordo is offline  
post #8 of 8 (permalink) Old August 11th, 2014, 13:06 Thread Starter
Registered User
 
Join Date: Sep 2012
Age: 31
Posts: 73
OldTrader Rating: (2)
thanks gordo. It was fun, still have a few more things to investigate. Will keep everyone updated.
aeroMR2 is offline  
Reply

Tags
aerodynamics, analysis, aw11, drag, mr2

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MR2 Owners Club Message Board forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: (0 members)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome